Cute project translating all the keywords of JS, to help programmers where English isn't their first language: https://fhtr.org/js-i18n/ (looks like a proof of concept though)
Related Posts
Bril is a cute intermediate language for teaching (think simplified LLVM IR): https://www.cs.cornell.edu/~asampson/blog/bril.html
The idea of providing a standard JSON format to help students write basic passes is really elegant.
Blogging about my programming language project: choosing the basic syntax!
https://www.garden-lang.org/blog/syntax.html
It's weird that GitHub shows time since the last commit, but not time since the first commit. It's a nice way of seeing how mature a project is.